BMW 7 Series 745i2001–20084.4-litre N62 V8

BMW 745i Engine Replacement —Compare Prices &
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The 745i is powered by BMW's first N62 V8 — a 4.4-litre naturally aspirated engine producing up to 333 hp. It's a refined and smooth powerplant, but one plagued by valve stem seal failure and a host of oil leaks. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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BMW 745i Engines — from £1,500 to £8,500Code: N62B44A

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BMW 745i Engine Replacement Costs

  • Supply Only£3,500 – £6,500
  • Fitted (Indie)£5,500 – £8,500
  • Warranty12–24 months
  • Best ForMost owners — best cost/warranty balance

Figures above reflect the current 745i market. Used N62 engines are increasingly scarce. Reconditioning costs are high due to the engine's complexity. Main dealer replacement is no longer available — specialist rebuild is the only option.

Labour estimate: Fitting a 745i engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The N62's complexity makes it a specialist job.

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Common Problems With BMW 7 Series 745i Engines

1. Valve Stem Seal Failure

  • Symptoms: Blue smoke on cold start, puff of smoke after idling, excessive oil consumption (1L per 1,000 miles or more), visible smoke when accelerating from a standstill

  • Typical Mileage: 80,000–130,000 miles

  • Repair Cost: £2,500–£4,500 (valve stem seal replacement — specialist tools required)

  • Replacement Cost: £3,500–£6,500 (if oil starvation causes bottom-end damage)

  • Urgency: Immediate — the N62's valve stem seals are the single biggest weakness of this engine

Our recommendation:

The N62's valve stem seals are the engine's Achilles' heel. BMW specified an oil change interval that was too long for the N62, which hardened the seals, causing them to leak. Oil leaks past the seals into the combustion chamber, leading to blue smoke and heavy oil consumption. Replacement is expensive but well-understood by specialists. Many owners live with the oil consumption, but eventually the catalytic converters will be damaged. If you're buying a 745i, budget for this work or accept the oil top-ups.

Read the full valve stem seal failure guide /failures/valve-stem-seal-wear

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745i — Repair, Buy, or Replace?

Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.

Can It Be Repaired?

ProblemRepairable? · Typical Cost

Valve stem seals

Yes£2,500 – £4,500

Expensive but well-understood; specialist tools allow replacement without removing cylinder head

Oil leaks (valve cover, timing cover)

Yes£500 – £1,800

Labour-intensive but straightforward; catch before oil starvation

Water pump failure

Yes£500 – £1,200

Preventative replacement at 80k miles — cheaper than an engine

VANOS/Valvetronic failure

Yes£800 – £2,000

Specialist repair or rebuild; well-understood by BMW specialists

Timing chain failure (rare)

Usually NoEngine replacement

If chain jumps and valves hit pistons, replacement is the only option

Buying This 745i? Check These First

Buy if:

  • Documented valve stem seal replacement — the defining issue on the N62
  • Evidence of cooling system maintenance — water pump, thermostat and coolant changed
  • Full service history with frequent oil changes (not the extended BMW interval)
  • A well-maintained example where the previous owner understood the N62's needs

Avoid if:

  • No proof of valve stem seal work — you're buying a known risk
  • Blue smoke on cold start or after idling — valve stem seals are failing
  • Oil spots under the car without a clear diagnosis — oil leaks are expensive to fix
  • Poor service history — the N62 is unforgiving of neglect
  • Any engine warning light without a clear diagnosis

Closing verdict

The 745i is a genuinely desirable luxury saloon — but the N62 V8 that powers it has well-documented weaknesses. Valve stem seal failure is the defining issue, followed by oil leaks and cooling system problems. These are expensive to fix, but well-understood by specialists. If you're buying a 745i, budget for valve stem seal work (£2,500–£4,500) and cooling system maintenance (£500–£1,200). The reward is one of BMW's most refined V8s in one of the most comfortable cars ever made. Buy on history, maintain religiously, and the 745i will reward you.

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Buying Checklist

Before you buy a used BMW 745i (or before you commit to an engine replacement), check these:

  1. 1. Cold Start

    Any blue smoke? (valve stem seal warning — the most critical check on the N62)

  2. 2. Oil Consumption

    How much oil does it use between services? (valve stem seal or oil leak warning)

  3. 3. Service History

    Including evidence of valve stem seal work and frequent oil changes

  4. 4. Oil Spots

    Any oil under the car? (valve cover, timing cover, or alternator bracket leak warning)

  5. 5. Coolant Level

    Any unexplained loss? (cooling system warning)

  6. 6. Temperature Gauge

    Any history of overheating? (water pump or thermostat failure)

  7. 7. Engine Warning Light

    Have codes been read? Any unresolved issues?

  8. 8. MOT History

    Check for emissions-related failures (catalyst damage from oil burning)

Why this matters

A 10-minute check now can save you thousands later. The right 7 Series 745i is a superb long-term car — the wrong one can be expensive fast.

Engine Codes

This table's rows match Section 1B's Era Map exactly — one engine throughout this badge's production run.

N62B44A

Years
2001–2008
Power
325–333 hp
2025 Enquiries
[PATTERN DATA]
Avg. Recon Cost
£3,500–£6,500[BMW-QUOTE]

Technical SpecsN62B44A

Displacement
4,398 cc (4.4-litre)
Cylinders
V8
Compression Ratio
10.0–10.5:1
Fuel System
Electronic fuel injection (EFI)
Valvetrain
DOHC, 4 valves per cylinder, Double-VANOS, Valvetronic
Block Material
Aluminium
Engine Weight
213 kg
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Market Intelligence

Real data from thousands of 7 Series 745i enquiries in 2025.

Most Common FailureValve stem seal failure

The defining weakness of the N62 V8

Average Enquiry Mileage

90,000–140,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,500–£6,500

reconditioned, supply only

[BMW-QUOTE]

Most Requested Engine Code

N62B44A

The 745i's 4.4-litre V8

[PATTERN DATA]

Peak Enquiry Season

Spring

Classic car and performance car season

[PATTERN DATA]

Regional Demand

London
20%
South East
18%
South West
14%
Other Regions
48%
[PATTERN DATA]

Regional Demand Breakdown

20%London18%South East14%South West48%Other Regions

Frequently Asked Questions

Disclaimer: All prices are indicative UK market ranges based on historical quote data from our network of engine specialists.
Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes.
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

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  • Compare 745i Engine Replacement Companies

    see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the N62's valve stem seals, oil leaks and cooling system nuances.

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